| 摘要 |
PURPOSE:To compensate ageing of a vector control operation and a characteristic due to a temperature change by a method wherein the set value of a primary resistance is changed to make the difference of a comparator zero. CONSTITUTION:A shell discharge temperature detector 38, a shell discharge pressure detector 39, a shell intake temperature detector 40 and a shell intake pressure detector 41 for a compressor 1 are connected to an enthalpy arithmetic device 42, and the enthalpy arithmetic device 42 is connected to a torque estimation device A52. In addition, torque estimation devices A52, B53 are connected to a comparator 54, and the comparator 54 is connected to a vector control instruction arithmetic circuit 56. Then, the set value of a primary resistance is changed so as to make the difference of the comparator zero, the primary resistance which is affected by a temperature change is corrected, the actual work load of the compressor 1 is computed according to the Mollier diagram, and a primary resistance value is corrected to make a deviation zero while the deviation from a work load instructed on the basis of a torque current instruction is regarded as the thermal change of the primary resistance. As a result, it is possible to control an inverter without being affected by a temperature change. |
